Airframe 760749 was a DVIP configuration delivered to Eczacibasi from Coatesville around 2008. The current CEO was among the passengers.
As for cause, this tower is comparable in size to the Seattle SkyNeedle. I would imagine visibility would have to have been compromised.
Does the state of the tail section give any clues? It looks to have sheared cleanly right at the transition behind the engines. Could this be indicative of a broadside collision? Maybe they went hard pedal in a last moment reaction.